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Techno-economic aspects of electricity generation from a farm based biogas plant

Original scientific paper

Journal of Sustainable Development of Energy, Water and Environment Systems
ARTICLE IN PRESS (volume, issue and page numbers will be assigned later)
DOI: http://dx.doi.org/10.13044/j.sdewes.d7.0302 (registered soon)
Lina Jarrar1, Osama Ayadi2 , Jamil Al Asfar2
1 Chemical Engineering Department, University of Jordan, Amman, 11942, Jordan
2 Mechanical Engineering Department, University of Jordan, Amman, 11942, Jordan

Abstract

This study produces a technical and economic analysis of a farm- fed biogas plant that utilizes cow manure to produce electricity and heat via combined heat and power unit. The electricity generated is directly injected into the grid while heat is used within the biogas plant. The biogas system design was done depending on number of cows in the farm, which denotes the amount of manure available as feedstock. The economic performance of the proposed biogas plant was evaluated using various economic indicators. The levelized cost of electricity and the avoided greenhouse gas emissions were calculated too. The preliminary design and economic feasibility results proved the profitability of the manure-based biogas systems on wide range of farm sizes. The net present values of a 100-cow, 500-cow, 1000-cow, 1500-cow and 2000-cow farms were all positive. The internal rate of return values were 11%, 12%, 13%, 16% and 17% respectively, and the levelized cost of electricity  values were 0.071, 0.069, 0.064, 0.055 and 0.055 JOD/kWh respectively. The study also produced a design for a centralized anaerobic digestion plant depending on Jordan resources. The government role in promoting biogas-based electricity was discussed too.

Keywords: Biogas plant, CHP, Cow manure, Economic aspects, LCOE, GHG emissions.

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